Abrading machine



Jan. 1, .1935. c. l.. MATTlsoN ET AL.

ABRADING MACHI NE 7 sheet's-sheet 1 Filed March 2l, 1930 Jan. 1, 1935. c. A MATTISN ET A1.

ABRADI NG MACHI NE Filed March 21, 1930 7 Sheets-Sheet 2- ma. www

Jan. 1, 1935.

C. L. MATTISON ET AL ABRADING MACHINE Filed March 2l, 1930 '7 Sheets-Sheet 3 Jan. 1, 1935.

C. l... MATTISON ET AL ABRADING' MACHINE 7 Sheets-Sheet 4 Filed March 2l, 1950 Jan. 1, 1935.

c. L. MAT'nsoN ET AL ABRADING MACHINE fr sheets-sheet 5 Filed Maron 21, 195o ouali ffl/ecZ/ZUZa/Z Jan. 1,1935. C, L, MAWSON ETAL 1,986,005

ABRADING MACHINE 'T Sheets-Sheet 6 Filed March 2l, 1950 ffy/@mr Qld //af l @Zai ,e

c. L. MATTlsoN Er A1.

Jan. l, 414935.

ABRADING MACHINE sheets-sheet 7 Filed March 21, v1930 Patented Jan.v y1, 1935 1,956,005. l ,-ARADINGMeCmT Carl Lawrence Mattison and"Louis`T.iMedholdt, Rockford, VIll.,dassignors itovMattiso'n Machine Works, Rockford; Ill., a corporation of'lllinois Applica-tion. Marca 1241,. 1930, *serial No 437,637

"comme (o1. 51-.154) 7 -The^generalobjectof this invention produce. a K machine ofv 'af distinctly newtype .which is ,especially `suited for 4sandingwor vsmoothing pieces of work Vhaving circular or approximately 5 circular contour such as the legs and similar parts f vention 'a'ims' to provid'e novel lmeans .for 4mountl.of furniture; and `in pursuance of this` general objectnthe vinvention ai-ms to provide a, machine insvhich the pieces of work are supported and rotated on a lixed axis coincident with the laxis of `the "work,v and `in'vvhich a series ofabrading or sanding. deyicesfare k'successively moved into engagementwith ytherotating work sogthat theV work wi'lrlremain` :constantly invie-w rof ythefoper- 4ator andfsuccessive pieces of-worlry may be'con- `veniently fed to and y,discharged from the4 work- .holding and rotatingmechanism. 1

#Another object of the` invention is to provide in--a machine 4.of this `character novel meansA for mountingthe series of .sanding devices and fory causing them to be successively brought into play upon the piece of vvork.` y l A further object is .to .provide'a machine of this character.. which is fully automatic in operation andwhich is arranged to" take successive pieces of vvvorkffrom an` initial support, to present each piece Aof work injpositionf to beoperated -upon,to clamp the work between rotary spindles,` to au tomatically start rotation ofr thework, and .to `autonnattcally stop rotation .thereof-and discharge 'the work L'from thelmachineafter a predetermined length of time s .or .a .predetermined .lnumfV ber lof the sanding devices; have, acted f upon the 'A A more specific object .of the inventionis to produce ...a machineaof this character .in which lthe` abradi-ng' mechanism comprises a plurality 4of separate. sandinguni-ts mounted ,on a carrier Yto ,travel in endless paths,r eachv device .comprising -a broomflike-backing 4anda sheet...orgliseries of strips of sand-paper(:entending'alongthe outer face of such backing andarrangedto beyieldably pressed against :a rotating piece of `work in such a manner 4that the sanding surface will be permittedjto conform to`-any longitudinally irregular contour'of the Work. v

In p suan'ce of `the foregoing -object'li'the ining each vbroom and sand-paper facing on `its rier, andtorprovidezas 'a part .of v-thismc'nunting means a. magazine for. a roll of sand-paper and means by which a 'fresh section of the sand-'paper on said roll may be :quickly placed inoperative relation to the brooms for `-lferlcvval purposes.

' ing at Athe left .end.of,Fig.-1.

Another ,-.objectof the inventionfis'to provide means.v j by` which the work-.holding @and driving spindle maybe reversely driven .without .driving the sanding .deviccscarrien so as tolpermit vthe operator to operateupon the'work withfacutf.- ting, tool whenever necessary to touchjifnspecial rough spots or sharpen the ycontour of .thefedg'es n or designslon the pieces-of Work.'V

Otherspeciiic and,.anci1lary .objects relating to particular-parts or mechanisms of the machine and looking toward f the accomplishment of "the foregoing .objects-Will be understoodfrom the fol-L. lowing .detailed descriptionof the .preferred bodiment .of .the .invention taken inyconnection with ythe .accompanying drawings,

A Intheldraft/irigs;`

.Figure 1 isa ,front Aside.

pletemaehine. .Figf..2'is aplan view., of.tl1e,machine.ik n y Fig..3 is an end elevation' ofthe machine look-- Fig. vlis .a frontelevation onlan enlarged; scale illustrating .the means .for supporting'and drivfing the work'gandfor' presenting 'the work .discharging 'it from said supporting means.

., Fig..5 :is a plan viewof .the structure illustrated `in Fig., 4 showing theheadstockiand t'ailstockin4 section.

. Fig.. 6 isa View per .portion of the ,machine .looking .toward the headstock end .(.the left .hand .end ,iIllFigz 11....1 f"

Fig.. 7; is'a view in cross sectionthroghthe upper ,part of the machinelooking 'towardfthe tailstockend @he right hand .end inFi .1)"

omitting the sanding 'drum' structure ,means`v @for Vcontrolling Vthe y l.driving "motor and vthe clutchby which the rotarysandingdrnm structure is driven.

` The` machine illustrated inrthefdrawings and: --herein ,described in detail represents .the preferred l ,embodiment of our invention but it vSh'oiil'df be understood .that thisdisclosue is merely illustra'- .tive las showing one' .mannenof carryingttheinvention intol Aeiect and` is' not.V to lbe considered A.as anylimitationof the. invention ofwhichl-.this

.disclosure .is an embodiment... The .scope fof the which @remmende plurality@ .indevadeat The present machine comprisesjinjgeneral a y 'invention .will be setforth intheappend, claims. carrier, whichnme'ans'permits yof Widexlattude'of 5.,

adjustmentA of the .sanding-.devices on Athe, caryelongated drum-likestructure comprisingla pair 1 "of fend l.heads connected by longitudinalrods lon y 5.5

'soy

Lio

sanding units. Each of these units'comprises a brush, a sand-paper facing therefor, a magazine containing a roll of sand-paper, the end of which provides the said facing fo-r the brush, and means for clamping the brush and sand-paper and for adjustably fixing the unit as a whole in the desired position upon one of the said longitudinal rods of the drum. y

'I'he means for supporting and rotating the work comprises a head-stock and a tail-stock mounted at opposite ends of the machine at the front side' thereof, means for rotating the headstock spindle including a friction clutch which drives the spindle only when apieceiof work is pushed against the end ofY the spindle tooperatei;

the clutch, and means for automaticallyretract-y ing the tail-stock center to release a piece of work supported4 by the head-stock and tail-stock centers and to permit the placement-of a fresh piece of work in line with said centers, the said retracting means actingfto causethe tail-stock center to engage the work/When so presented and pushjitv against "the head--stock center for the purposel of rotatably clamping thework and actuating the. clutchin thehead-stock to set the work-in rotation. v i

Themeans for 'automatically feeding the'work tooperative position and for discharging the work comprises an initial supportV for the Work piece,

a 'pair of forks located respectively'adjacent to the head-stock4 and tail-stock and, arranged to i take the 'piece of work from said support andv to center work in relation tothe head-stock and y tail-stock centers, and automatic means operating in timed sequence with relation to the movements of the tail-stock, as before described, to bring said forks into operative position when the tail-stock center is retracted and to Withdraw said forks to an inoperative position as' the centers of the'headstock and the tail-"stock clamp the work and before the head-stock vclutch is engaged. When the sanding operation isLcompleted vthe work .falls by gravity into a suitable receptacle upon retraction of the tail-stock center as before described.

Driving and timing mechanism is provided for rotating the-drum and for actuating the mechanisms referred to 'in timed sequence so that as long as the pieces of work are kept supplied to the initial support either by the operators hand or by a suitable magazine, the machine will continueV to pick successivework pieces from saidy the embodimentof the invention shown inthe 'drawings, the machine comprises a base or main supportingframe in the upper end of which "a drum-like structure 21 is rotatably mounted, said structurev comprisingra shaft 22 mounted fin end bearings on the base and having fixed thereon a pair offend heads, 23 which are rigidly connected by a plurality-'of longitudinal bars 24 located near the peripheryV ofsaid heads.

, On each one ofthe bars 24 'is mounted a sandjing'unit designated generally as 25, eachI unit ,comprising abrush or broom 26 having a head vwith straws or bristles fixed therein and aA sheet 1 "of sand-paper 2'?, the end section of which overlies the front or operative face of the broom and the remainder of which sheet is formed into a roll 27a, the broom and sand-paper being secured in a holder 28 and the holder being adjustably secured upon its bar 24. It will be understood that one or more of the sanding units may be mounted on each of the bars 24, and that one or more sheets of sand-paper 27 maybe associated Withfeachbrush 26.1

The holder 28 comprises two separable complementary sections 28a and 28b which provide threaded in a lug 28d on one section and bearing at its end against a lug 28e on the other section. This screw 2,8c serves as a means of securing the two sections together. The broom 26 is clamped in the holder and the holder as a whole `is clamped to thebar 24 by providing a pocketl in the holder sectionA 28a and a thumb screw 28f having a conical inner? end which enters said pocket and bears against the bar 24 thereby serving to draw down on the holder and grip the bal' and the broom tightly. y

The drum 21 is arranged'to be rotated slowly in'a counter-clockwise direction as viewed in Fig. 3 by the following drivingmeans. 'An electric motor 29 has a worm 30 fixedon its armature shaft which meshes with la worm wheel 31 fixed cna shaft 32, said shaft also having fixed thereon a bevel pinion33- meshing withI a bevel gear .wheel 34 mounted on a stub shaft 35.` On this stub shaft 35. is fixed asprocketwheel 36 which drives a sprocketfchain 37 running over a sprocket wheel 38 fixed on the drum shaft 22. 1 4 v l The drum 21 is also givena continuous oscillation along its axis to effect arelative movement of the sanding brooms lengthwise of the axis of K the work for the purpose of providing a smoother and better finish-upon the workj The means for effecting this oscillatory movement of the drum comprises a lever 39 pivoted at 39a on the machine frame, the upper end of said lever having a fork provided with bearings which receive diametrically opposed trunnions on a collar 40 fixed to the drum structure.:v The end of the lever 39 below its pivot extends inwardly through an openingin the machine base to provide ahorizontally ex tending arrn which is connected at its end by means of alink 41 to an eccentric mounted on the shaft 32 so thaty in the rotation of said shaft and eccentric the lever 39 will be rocked slightly and longitudinal reciprocation.v of the whole drum vstructure 21 will be effected.

K yThe headstoclc mechanism i Referringl `W to the means for supporting and rotating a piece of work in position to be engaged by the sanding units 25,. this means comprises`a headstock at the left hand end of the machine and a tail stock at-the right hand end `of the machine, as 7viewedin Fig. 1, the headjstock-having-a rotary driven center and the tail stock having a dead center, ybetween which centers the ends yofthe work are clamped in a manner well known in the machine tool art.

The heads'tock mechanism will be first described, It comprisesa rotary spindle 42 mounted when a piece of Workisclairpedibetween'fthe head foonrpriseszan. annular'fctron bnakefelement -50 'imovement f's'ueh .means "as a 1lever 5=1k f'iskpiv'oted fon2a=stat`ronarypivot f52 and .has a, :ring portion 51%pivotallyfconnectedtoI-opposed studs lb `(Figs. `Zand it) fon? the' bnake r element 150 whereby to moveftheelementjinto engagementwthfthe head viewedfzinsilig-5a; Thewlever =51wcarries a roller stud 53which is arranged to :beezperiodically'fen gage'dby a'rotary cam to ybe laterdescribed'for th'efpurpose L'of vautomatically Aapplying the brake f'to stop 'l'rotation of the1head`47;

` y 'Thermo' @roekmeerwpmsm-4 e `The tail stock comprises -a. cylinder 5dr` stationarily mounted on they. machine frame, andra plunger v slidable in fsaid `cylinder 'and having fixed lon its outer 'end ga cross head 56 which` carries a rdeadfcenterw? spaced `'horizpmltally from 'lthe 'fcylin'der )axisV in 1a `'direction towardY the raxis of the'thum 2112,.` Afcoiled,springfywithin the cylinder fsu-rrounds fa reduced portion of the Iplunger '55 "and exertsitsiprsure @between va .shoulder ori rsaid 'plnneercand fa; sleeve f 59^sld`ably fmounted inthe rear #end fof 'thefcyflinderandsniff;M

able therein by means of'aj tensioning-screw@ to vary the tension on said spring. This Vsfming thus 'exerts fconstant:pressreztending `te move the tail stock` center 45?? 'toward the hea:dstook eenter5f48 --lenrent 'which passes through a :slot 'ikntheieyline release the work atthepropenQti-me;

It wil-l be noted thatthe entire tail ystoelnfzneehanism-` is mounted onffa bracket `or. tablefwheh "projects beyond one `enclof themachine fra-me `that extra long pieces of Work maybersmpported fand the taiflfstocki's `'connzletely fou fot the `Way io'fsthe isanding' unitsi2'5 jwnienmay montedlfat theextreme mnt-shane: en'dfof the asviewed in. front/ of the .headstock andv tailstock nisim flhefeam. driimffor thehead'stoc I cam projection V(i'itheeor-i arrangedto enga .roller studonthebrak applyingleven 51 and y vthev cam eylinden opposite the tail stock has a cam projection 67 arrangedtoengage the, roller stud 62v on the 4hand lever v6l'. to 'retract the gta'il stock center 57`from Work-supporting position.p The cam shaft 6'3 is jdrive'n from 'thefsanding drum shaft 2.2ft1lr'0u`ghl the medium 0f acoi'intlishaft 68 which is connected byI a 4sprocke'tf'cliain f B9 v'totliesaiddrunr `shaft arid-at its 0thrend1i's connected to ithe @am shaftqcs 'by'agsprocket chaine Iorunning over sproketlwheels' "'Ii; 1'

,alsa

presentinjgVK means :provided for automatically pckfing'up a pijece of Worlifrom thebracket's 7.2 andc'entering 'the work relation tc'tlefbea'd'- stock land' tail'stock centers readilyfto"bey clamped ilo'etiwveeyn 'said centers., saifclifwork presenting means comprises vf-shaped `carriers "7'5' tireL forf- Ward-arxn of the Vbngflongaited'so thatfwhen fthe carriers fare 'elevated these "lel'onglate'df' arins wllpibk vo'fffa piecefof workvfrnithe braclet'sl and 'cause'the Work-to rollo'k'islide ddwnt'tlie l "off-the V. Each carrier `isfrnonr'l-tedT015y vermoeiend horizontal adjustmenty i ",al-"nang'er f. y'76 which suspended er pivotaliy supported? from the lower end of a link 7 7,`the latterbeing stationarily pivoted at its upper end to a sultf able support.. The means.v for relevating-thel-oar? riers at opposite ends ofthe-:machine asesim-A l ilarbft v`differ slightly'. vAtvjthe beadstoek end; Yan arm-.'78 -xed ,with relation fto. the, link- SITZ lhasa s ltthe'rein Whiclireceives alateral: projection on tli'efupper end of a vertical arm ,-19 wh-ic'hfdspwe oted'eat lower e'ndlon asfixedpivotf saidarm 179' carryingfatdts Aupper lencia-roller 579 vvalue1-ris frranged` to be veng'aliged{.fl;x y acani ,projection -80 Von the earn dr'imjiilso 'that at fa predetermined "timetliecarrie 75 ,will be, elevated Aandl'as .soon 'as' the; 80, jpass'es will descend by its/.ovvia weight L f j 5 1 f 't Carrieri.0'Drzi'tirg` means at the tailstock end: of the machine comprises a 'vertical arm. crear- 'ryingat its upper end fa p inqz" arranged 'to, abut agaiiis't,V the depending "link/TTI; said 'Vertcaljarm lalso 'carrying a roller 'studvfwlarranged toffbe engaged byacan projection 183 yon the'caxn eylin`` der 'e5 so that the :work fcar'riervs'win 'b-ejperindically y raised jby theA cam '83 and will; descend "by gravity-aferfhefemfhasressedfhefrouerx v pf'stat`ionary-guides 84,`n1ounted"respee jacent to the heads'tock and tail'stock,

tig l feoactfwl nimesupportingibraekets"vzftefposinon n [brackets carried by pins which are adiustably mounted in clutch device is actuatedy by a rod v.89, one ,endy

of which is attached toa hand' lever 90 pivot'ed at`91 (Fig. 8) andfconnected by a link 92 to a lever 93' which has one end located in position to be engaged lby. the motor starting.. lever 87. By moving thisstarting lever 87 in opposite directions'from the fullline position ,seen in Fig. 8 the motor'ma'ybe driven in either direction as maybe desired. If the starting lever is moved to the left, the motor will be driven in .the direction to rotate the drumstructureZl and the headstock spindle' in a counterclockwise direction as viewed in Fig. 3. it is sometimes desirable, however, ,tol be able to rotate the headstock spindle in the `oppositedirection vfor the purpose of permitting the operator to perform an operation with a lathe toollupron a piece of work held by the centers, and in such acase it is desirable to insure` thatv the rotation .of the sanding drum `structure will beprevented during` such operationyf'he meansy above described accomplishes this result because when the motorstarting, lever 87 is 'moved to the right to reverse the motor, saidlever engages the lever 98 and throughathe parts connected therewith disengages theclutchl devicel 88 andv prevents rotation of the ldrum, .,structure. By meansoof the hand lever the operator may also` stop rotation of the drumstructure any time he de- -sires without, operating the motor starting lever Operation of the machine j k In operation let it be assumed-'that y'the cam 66 is holding the brake operating lever'in brake applied position and that the cam` 67 is in position holdinglthetailstock c'enter'57 in rejtracted position, the cams 80` and 8 3 will have by this time elevatedthe Work carriersl 75 to pick off the piece of Work from the supporting brackets 72 and present the workinalinement with Vthey headstock and tailstockcenters.

AAs soonas the cams 66' and v6'! pass'outof engagementwith the` roller studs on the brake lever and tailstock retracting lever respectively, the brake will be released and the tailstock center pressed forward to engage .oneend ofthe work piece and press the other end against the headstock center,.thereby shifting the head 47 to carry its ange `472"` into frictional engagement `withthe driving disk 49, thus setting the headstockl center and 'therefore theV work piece in rotation. Simultaneously with this engagement of the centers with the work,vthe camsf't) and 83 will have moved out of position to permitdescent of the work carriers 75 so that theyfwill be out of thewaybefore the rotation of the workbegins. Y

`headstock spindle anda tailstock spindle both v Since thel headstock isr driven directly yfrom the driving motor and the sanding; drum is driven by reductioneearina the .piece of vwork wilhbe rotatedvery rapdly'whle the drum rotates very slowly and in the rotationof the drum the sandking units A25yvi1l-be successively carried into engagement with the work;` Since thebroom backing vfor the4 sand paper isyeryilexible it .will conform to the irregular shape'or varying diameters of the work so that the sand paper will be rmly pressed down into the grooves in the work, yas well as the convex faces.` `Also the endwise oscillation-or. reciprocation of the sanding drum will cause the Vsand paper to continuously shift lengthwise Vof vthe work so that there will beg-no circular scratchesor depressions made in the work by the sand paper. Y

We claimas our invention:

1. An abrading machine comprising, in combination, means for rotatably supporting a piece ofy work, a rotary carrier, a plurality of sanding units mounted on said carrier. and arranged tobe successively 'brought into engagement with the work, and vmeans for independently 'and adjustably mounting said units onsaid carrier to adapt said machine for voperation. on varioustypes of `work-pieces, each of saidY units comprising a broom fa flexible rolled strip of. abradingsheet material the end of which is backed by said broom, anda support forming a part of ieach .unit for carrying the roll of that unit,each of saidsup- `ports being removableA and adjustable as a part of its sanding-unit.

2. An abrading machine comprising, in' combi- `nation,-a pair of centers forsupporting and rotating a piece of work, means for applying an abrading element to the rotating work, friction means for'driving one of said centers and arranged to be set in operation byv pressure of the Work against such center, braking meansv for stopping rotation of said driven`center, means applying pressure to the opposing center'to place the work against said driven center, the latter means being retractable to release the work 'and mechanism for automatically actuating the braking means and for'retracting 4said retractable center against .the action of its placing means to eilect successively the clamping and rotating of A a piece of work and the releasev and'discharge lthereof vfrom said-centers. f v

3. An labrading machine comprising, in` combination, a' rotary drum-like structure having a plurality of longitudinal bars disposed about its periphery. `I and afplurality of sanding units mountedon'the `respective bars .for adjustment both longitudinally'and rotatably on the bars, each ofi'said units comprising a broom-like backing, a sheet of sand-paper having one end section underlying-said backing and the remainder kof the sheet coiled into a roll and means exerting a clamping pressure upon said backing and upon `saidbar to secure the ,backing in place and to adjustably x the .unit'on the bar, theflast mentioned .means providing Va receptacle for said saidbroom and sand-paper, said means providing a receptacle for said-ro1la clamp for said broom and means tosecure the unit as a whole upon a carrier. f f

5. InI a sanding machine the combination of a mounted rotatably and forrlimited longitudinal movement on a iixed axis, and disconnectible on a fixed axis, disconnectible driving means for said headstock spindle rendered operative by longitudinal movement of said headstock spindle when a piece of Work is clamped between'the spindles, and automatically operable meansto actuate the tailstock spindleto clamp and unclamp work pieces between the spindles.

'7. In a sanding machine the combination of a headstock spindle and a tailstock both mounted rotatably and for limited longitudinal movement on a fixed axis, disconnectible driving` means for said headstock spindle rendered operative by longitudinal movement of said headstock spindle when a piece of work is clamped between the spindles, automatically operable `means yto* actuate the tailstock spindle to clamp and unclarnp work pieces between the spindles, andmeans operable when said tailstock spindle is moved to and stop rotation of said headstock spindle. f

8. A machine of the' character described comprising, in combination, work supporting means rotatable on a iixed axis, a lplurality of sanding units, a carrier for said units arrangedto` move said units along an endless path and successively finto operative A engagement 4with the work, and means operable selectively to move said carrier and saidwork supporting means so that the engaging surfaces of the units and -work move in opposite directions, or to rotate said work supporting means in the oppositeV direction While said carrier remains stationary.

` l9. A machine of the character describedi-:om-V

endless path 'and successively into engagement withfthe work, reversible' actuating means for Vrotating said Work supporting means in opposite directions, a disconnectible` drive: between said actuating means and said carrier, and a control for reversing said actuatingmeans operable" to disconnect said drive when said work support.

ing means is rotated in one direction.

LOUIS T. vME'DI-IOLDI. y CARL LAWRENCE MATTISON. 

